A ray of light falls on the surface of a spherical glass paperweight making an angle α with the normal and is refracted in the medium at an angle β . The angle of deviation of the emergent ray from the direction of the incident ray

(a) α-β                     (b) 2α-β

(c) α-β/2                 (d) β-α

Concept Questions :-

Refraction at curved surface
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Light enters at an angle of incidence in a transparent rod of refractive index n. For what value of the refractive index of the material of the rod the light once entered into it will not leave it through its lateral face what so ever be the value of angle of incidence 

(a) n>2                        (b) n=1

(c) n=1.1                        (d) n=1.3

Concept Questions :-

Total internal reflection
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One face of a rectangular glass plate 6 cm thick is silvered. An object held 8 cm in front of the first face, forms an image 10 cm behind the silvered face. The refractive index of the glass is [Consider that light ray returns back in the first medium]

(a) 0.4                     (b) 0.8

(c) 1.5                     (d) 1.6

Concept Questions :-

Refraction at plane surface
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One side of a glass slab is silvered as shown. A ray of light is incident on the other side at angle of incidence of 450. The Refractive index of glass is given as 1.5. The deviation of the ray of light from its initial path when it comes out of the slab is:

(a)   90o

(b)   180o

(c)   120o

(d)   45o

Concept Questions :-

Refraction at plane surface
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Two transparent slabs have the same thickness as shown. One is made of material A of refractive index 1.5. The other is made of two materials B and C with thickness in the ratio 1:2. The refractive index of C is 1.6. If a monochromatic parallel beam passing through the slabs has the same number of waves inside both, the refractive index of B is

(a)   1.1                                      (b)   1.2

(c)   1.3                                      (d)   1.4

Concept Questions :-

Refraction at plane surface
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The image of point P when viewed from the top of the slabs will be

(a)   2.0 cm above P

(b)   1.5 cm above P

(c)   2.0 cm below P

(d)   1 cm above P

Concept Questions :-

Refraction at plane surface
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Two point light sources are 24 cm apart. Where should a convex lens of focal length 9 cm be put in between them from one source so that the images of both the sources are formed at the same place?

(a)   6 cm                                   (b)   9 cm

(c)   12 cm                                (d)   15 cm

Concept Questions :-

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There  is an equi-convex glass lens with radius of each face as R and μga=32 and μwa=43. If there is water in object space and air in image space, then the focal length is :

(a)   2R                                      (b)   R

(c)   32R                                 (d)  R2

     

Concept Questions :-

Lensmakers' formula
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A prism having an apex angle 4o and refraction index 1.5 is located in front of a vertical plane mirror as shown in the figure. Through what total angle is the ray deviated after reflection from the mirror?

(a)   176o

(b)   4o

(c)   178o

(d)   2o  

Concept Questions :-

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A rectangular glass slab ABCD, of refractive index n1, is immersed in water of the refractive index n2n1>n2. A ray of light is incident at the surface AB of the slab as shown. The maximum value of the angle of incidence αmax, such that the ray comes out only from the other surface CD is given by

                        

(a) sin-1n1n2cossin-1n2n1                 (b) sin-1n1cossin-11n2

(c) sin-1n1n2                                      (d) sin-1n2n1           

Concept Questions :-

Total internal reflection
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